The Gefechtsturm or G-Turm (lit. "Battle Tower")Built in 1941-2, alongside the S-Bahn line, by Italian and French workers.In 1948 - 51 the G-Turm was partially demolished and the two southerly gun platforms destroyed. 1.6 millon cubic meters of rubble was heaped up around base to form artificial hill and to enhance the park to plans by Garden and Building Department Leader Gunther Rieck. The work was carried out by local jobless people. Most of the rubble was pilled around the south, east and west sides, access being available. But as the tower is build in close proximity to the railway, to the north, dumping and pilling rubble was not done to any great depth. So the northern side is left partially exposed.The northern face of the bunker is still visible. In the north of the park, and now known as "Humboldt-85 höhe" it overlooks the Hochstrasse and the Gesundbrunnen U-Bahn station.

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This is one of 3 tours organised by the Berlin Underground Association. Basically, this group sets up guided tours of WW2 and Cold War-era monuments and pressures the government to preserve them.